I am building something...
How can I keep a stable amperage on a circuit?
#1
Posted 24 March 2013 - 05:11 AM
#2
Posted 24 March 2013 - 10:49 AM
The thing about current is you have to draw it out. V=IR so of you want to pull a certain number of amps from a battery or a source you know the voltage of, you need to figure out the resistance needed. Never just attach two wires to the terminals of your source. That is mathematically equivalent to infinite current and causes a short circuit, which is dangerous even with small sources
#3
Posted 24 March 2013 - 04:46 PM
PowerLoss = P2R/V2 which means the higher your voltage the more loss you will have over time. So you can lower your voltage using a transformer and therefor raise your Amperage which will minimize power loss. We could be on the wrong track though so more context would be preferable.
#4
Posted 24 March 2013 - 07:30 PM
More than likely he wants to go from something like a 20 amp wall plug to something more manageable, similar to how phone chargers work. Stepping transformers and resistors are the way to go, along with a capacitor more than likely.